DistWeight {Rquake}

Distance wheighting

Description

Distance weighting for non-linear earthquake location.

Usage

DistWeight(dist, err, distwt)
DistWeightLL(lat, lon, elat, elon, err, distwt)
DistWeightXY(x, y, ex, ey, err, distwt)

Arguments

dist

distance in km

err

sigma error in seconds

distwt

distance weighting parameter

lat

Latitude

lon

Longitude

elat

Event Latitude

elon

Event Longitude

x

station X(km)

y

station Y(km)

ex

event X (km)

ey

event Y (km)

Details

Based on Lquake scheme from University of Washington. If you need to reduce the effect of distance weighting, increase distwt.

Since the hypocenter moves between each iteration, the distance weighting is updated.

Value

vector of weights

Author(s)

Jonathan M. Lees<[e-mail]>

Examples

DistWeight(1:10, .4, 20)